WEST BENGAL CIVIL SERVICE
EXAMINATION - 2004
Zoology Paper-I
Time Allowed-3 Hours Full Marks-100
Group - A
(Answer any three questions.)
1. What is amoebiasis ? Describe the morphology of three phases in the life cycle of Entamoeba histolytica. How many metacystic trophozods are developed from a cyst of E.histolytica. 3+12+5
2. Define torsion. Mention the mechanism involved in the process of torsion. Describe the torsion that is manifesed in the nervous system of Mollusca. 3+5+12
3. What is retrogressive metamorphosis? Explain the phenomenon in the life history of an ascidia. State its significance. 5+12+3
4. What is accessory respiration ? Describe the structure and functions of the accessory respiratory organs of four fishes. What are the adaptive and evolutionary significance of the accessory respiratory organ. 4+12+4
5. Write short notes on any four of the following : 5x4
(a) Retia mirabilia
(b) Echolocation in Chiroptera
(c) Foramen Panizza
(d) Parthenogenesis
(e) Alternation of generations
(f) Aerodynamics.
Group — B
Answer any two questions
6. How does a sanctuary differ from a National Park ? Describe some important wild life sanctuaties and National Parks with their characteristic animal fauna. Name two endangered species of mammal and two threatened species of fish. 4+12+4
7. What is composite fish culture ? Describe the principle and different steps involved in the composite culture of carps. Comment on the production and carrying capacity of the pond. 3+3+10+4
8. Write short notes on any four of the following : 5x4
(a) Ecological backlash
(b) Edge effect
(c) PAN
(d) Biomagnification
(e) Photoperiodism
(f) Standard deviation.
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